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  • ENGINEERING (GENERAL)  (2)
  • COMPUTER PROGRAMMING AND SOFTWARE  (1)
  • 1985-1989  (3)
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  • 1
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    Design considerations for a micro-g superfluid helium fluid acquisition system (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The general description, the operation, and the design of a superfluid helium (SFHe) fluid acquisition system (FAS) for use under microgravity conditions is presented. For the type of FAS considered here, where fine-mesh woven screens are used to retain flowing SFHe within a gallery arm (flow) channel, those forces which determine the flow dynamics are the micro-g accelerations, liquid surface tension, and tensile strength and cumulative pressure drops along a flow path that begins at the bulk liquid and ends at the entrance to a pump. For this case, the dimensionless number, N(T) is written as the ratio between the pressure drop across the screen and the surface tension forces at the screen for low fluid velocities. Static Bond number measurements have bene taken for SFHe using 325 x 2300 twilled Dutch screen and have indicated a screen pore hydraulic radius of 0.00031 cm.
    Keywords: ENGINEERING (GENERAL)
    Type: Cryogenics (ISSN 0011-2275); 29; 523-527
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Off-line programming motion and process commands for robotic welding of Space Shuttle main engines (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The off-line-programming software and hardware being developed for robotic welding of the Space Shuttle main engine are described and illustrated with diagrams, drawings, graphs, and photographs. The menu-driven workstation-based interactive programming system is designed to permit generation of both motion and process commands for the robotic workcell by weld engineers (with only limited knowledge of programming or CAD systems) on the production floor. Consideration is given to the user interface, geometric-sources interfaces, overall menu structure, weld-parameter data base, and displays of run time and archived data. Ongoing efforts to address limitations related to automatic-downhand-configuration coordinated motion, a lack of source codes for the motion-control software, CAD data incompatibility, interfacing with the robotic workcell, and definition of the welding data base are discussed.
    Keywords: COMPUTER PROGRAMMING AND SOFTWARE
    Type: Journal of Robotic Systems (ISSN 0471-2223); 4; 355-375
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Turbulent transport of He II in active and passive phase separators using slit devices and porous media (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The turbulent transport mode of vapor liquid phase separators (VLPS) for He II has been investigated comparing passive porous plug separators with active phase separators (APS) using slits of variable flow paths within a common frame of reference. It is concluded that the basic transport regimes in both devices are identical. An integrated Gorter-Mellink (1949) equation, found previously to predict VLPS results of porous plugs, is employed to analyze APS data published in the literature. It is found that the Gorter-Mellink flow rate parameter for 9-micron and 14-micron APS slit widths are relatively independent of the slit width, having a rate constant of about 9 + or - 10 percent. This agrees with the early heat flow results for He II entropy transport at zero net mass flow in wide capillaries and slits.
    Keywords: ENGINEERING (GENERAL)
    Type: Advances in cryogenic engineering.; Jun 14, 1987 - Jun 18, 1987; Saint Charles, IL; United States
    Format: text
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    NASA TECHNICAL REPORTS
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